Resin materials for making three-dimensional objects and methods of using the same

A method for forming a three-dimensional object, comprising:

• providing a printing region defined by a forming platform and a resin reservoir having a forming surface;
• filling said printing region with a polymerizable liquid, said polymerizable liquid including a blocked or reactively blocked polyurethane prepolymer, a blocked or reactively blocked curing agent, and a photoinitiator, wherein the blocked or reactively blocked curing agent is a diol compound with two hydroxyl groups protected, a diamine compound with two amino groups protected, or a diimine compound with two imino groups protected, and under a reactive condition, protecting groups in the blocked or reactively blocked curing agent are cleaved to make the two blocked amino groups, the two blocked imine groups, or the two blocked hydroxyl groups exposed to form the two amino groups, the two imine groups, or the two hydroxyl groups for curing;
• exposing said printing region filled with the polymerizable liquid to energy to form a solid printing intermediate having substantially a same shape as said three-dimensional object;
• and
• providing energy to said solid printing intermediate to form said three-dimensional object.